Electronic cigarette



FIG. 1 is a perspective front View of an electronic cigarette;

FIG. 2 is a front View thereof;

FIG. 3 is a rear View thereof;

FIG. 4 is a top View thereof;

FIG. 5 is a bottom View thereof;

FIG. 6 is a left side View thereof; and,

FIG. 7 is a right side View thereof.

The broken lines in the drawings depict portions of the electronic cigarette that form no part of the claimed design. 

CLAIM The ornamental design for an electronic cigarette, as shown and described. 